must gratulate
Regular verb: gratulate - gratulated- gratulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gratulate
you must gratulate
he must gratulate
we must gratulate
you must gratulate
they must gratulate 	I must be gratulating
you must be gratulating
he must be gratulating
we must be gratulating
you must be gratulating
they must be gratulating	I must have gratulated
you must have gratulated
he must have gratulated
we must have gratulated
you must have gratulated
they must have gratulated	I must have been gratulating
you must have been gratulating
he must have been gratulating
we must have been gratulating
you must have been gratulating
they must have been gratulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not gratulate
you must not gratulate
he must not gratulate
we must not gratulate
you must not gratulate
they must not gratulate 	I must not be gratulating
you must not be gratulating
he must not be gratulating
we must not be gratulating
you must not be gratulating
they must not be gratulating	I must not have gratulated
you must not have gratulated
he must not have gratulated
we must not have gratulated
you must not have gratulated
they must not have gratulated	I must not have been gratulating
you must not have been gratulating
he must not have been gratulating
we must not have been gratulating
you must not have been gratulating
they must not have been gratulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gratulate?
must you gratulate?
must he gratulate?
must we gratulate?
must you gratulate?
must they gratulate? 	must I be gratulating?
must you be gratulating?
must he be gratulating?
must we be gratulating?
must you be gratulating?
must they be gratulating? 	must I have gratulated?
must you have gratulated?
must he have gratulated?
must we have gratulated?
must you have gratulated?
must they have gratulated? 	must I have been gratulating?
must you have been gratulating?
must he have been gratulating?
must we have been gratulating?
must you have been gratulating?
must they have been gratulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not gratulate?
must you not gratulate?
must he not gratulate?
must we not gratulate?
must you not gratulate?
must they not gratulate? 	must I not be gratulating?
must you not be gratulating?
must he not be gratulating?
must we not be gratulating?
must you not be gratulating?
must they not be gratulating? 	must I not have gratulated?
must you not have gratulated?
must he not have gratulated?
must we not have gratulated?
must you not have gratulated?
must they not have gratulated? 	must I not have been gratulating?
must you not have been gratulating?
must he not have been gratulating?
must we not have been gratulating?
must you not have been gratulating?
must they not have been gratulating?